Patents by Inventor Robert C. U. Yu

Robert C. U. Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8142967
    Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrostatographic, including digital, apparatuses. More particularly, the embodiments pertain to an improved electrostatographic imaging member incorporating a carbon nano tube dispersion into a high molecular weight polycarbonate and an anti-static copolymer with polyester, polycarbonate, and polyethylene glycol units in a formulation for the anti-curl back coating layer which provides a conductively suitable and stable dispersion coating solution for making an optically suitable anti-curl back coating layer.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: March 27, 2012
    Assignee: Xerox Corporation
    Inventors: Yuhua Tong, Edward F. Grabowski, Donald J. Goodman, Kock-Yee Law, Robert C. U. Yu
  • Patent number: 8124305
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the incorporation of a liquid compound having a high boiling point into the charge transport layer such that an anticurl back coating is no longer needed for reduction or elimination of photoreceptor layer curling.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: February 28, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Edward F. Grabowski, Terry L. Street, Jimmy E. Kelly, Joellen Simone
  • Publication number: 20120045715
    Abstract: The presently disclosed embodiments relate generally to the formulation of an anticurl back coating layer that renders imaging apparatus flexible members and components their desirable flatness, for use in electrostatographic, including digital apparatuses. More particularly, the embodiments pertain to an imaging member comprising an anticurl back coating layer formulated to comprise conductive carbon nanotubes dispersion in a polymer blend comprising three film-forming thermoplastic polymers to: (a) render electrical conductivity effect for tribo-electrical charge elimination (b) impart static dissipation capability, and (c) provide surface energy lowering effect for contact friction reduction to ease imaging member belt drive as well as cutting tribo-electrical charge build-up under normal imaging member belt operational conditions in the field.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 23, 2012
    Applicant: XEROX CORPORATION
    Inventors: Edward F. Grabowski, Robert C. U. Yu, Kock-Yee Law, Yuhua Tong
  • Publication number: 20120034555
    Abstract: The presently disclosed embodiments relate generally to the formulation of an anticurl back coating layer that renders imaging apparatus flexible members and components their desirable flatness, for use in electrostatographic, including digital apparatuses. More particularly, the embodiments pertain to an imaging member comprising an anticurl back coating layer formulated to comprise a polymer blend of an anti-static polymer and a low surface energy A-B diblock copolymer polymer and an adhesion promoter. The embodiments provide an imaging member belt with the anticurl back coating that is electrically conductive and also substantially reduces its surface contact friction to help suppress/eliminate tribo-electrical charge build-up at the backside of the imaging member belt under normal machine imaging member belt operational conditions in the field.
    Type: Application
    Filed: August 5, 2010
    Publication date: February 9, 2012
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Edward F. Grabowski, Yuhua Tong
  • Publication number: 20120003575
    Abstract: The presently disclosed embodiments are directed to imaging members used in electrostatography. More particularly, the embodiments pertain to electrophotographic imaging members which have an added-on protective overcoat layer formulated to comprise of a novel A-B diblock copolymer comprising two segmental blocks of a bisphenol polycarbonate and an organic acid terminal which provides chemical vapor contaminant resistive property. The overcoat layer may further be formulated to include small quantity of charge transport compound. The present embodiments provide superior copy printout quality.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Yuhua Tong
  • Publication number: 20110318675
    Abstract: The presently disclosed embodiments are directed to layer(s) that are useful in imaging apparatus members and components, for use in electrophotography, including digital, apparatuses. More particularly, the present embodiments provide the negatively charged electrophotographic imaging members with a novel cross-linked charge blocking undercoat layer, which is created to comprise of a binary composition of melamine and formaldehyde or a triple composition consisting of a hydroxyl functional acrylic polyol binder and a methylolation of melamine-formaldehyde, and methods for making the same. The charge blocking layer provides stabilized cyclic photo-electrical properties, enhanced mechanical adhesion bonding, and improved copy print out quality for service life extension.
    Type: Application
    Filed: June 25, 2010
    Publication date: December 29, 2011
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Yuhua Tong, Min-Hong Fu, Stephen T. Avery
  • Patent number: 8084173
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: December 27, 2011
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Kent J. Evans
  • Publication number: 20110305981
    Abstract: The presently disclosed embodiments are directed to imaging members used in electrostatography. More particularly, the embodiments pertain to electrophotographic imaging members which have imaging layer(s) formulated to comprise of a novel A-B diblock copolymer binder consisting of two segmental blocks of a bisphenol polycarbonate and a phthalic acid which provides chemical vapor contaminant resistive property. The present embodiments provide superior copy printout quality.
    Type: Application
    Filed: June 10, 2010
    Publication date: December 15, 2011
    Inventors: Robert C. U. Yu, Yuhua Tong
  • Publication number: 20110287352
    Abstract: Present embodiments are directed to the preparation of curl-free flexible imaging members used in electrostatography. More particularly, the embodiments pertain to a structurally simplified flexible electrophotographic imaging member, including the incorporation of a plasticizer or a blend of plasticizers in the imaging layer(s) to effect imaging layer(s) stress relieving outcome for curl control without the need of an anticurl back coating, and methods for making and using the imaging member.
    Type: Application
    Filed: May 18, 2010
    Publication date: November 24, 2011
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Yuhua Tong
  • Publication number: 20110256474
    Abstract: The presently disclosed embodiments relate in general to electrostatography comprising improved features in the flexible imaging member that enhance function when used in the electrostatographic imaging system. These embodiments pertain, more particularly, to a structurally simplified curl-free flexible electrostatographic imaging member belt containing a stress/strain free ground strip layer and stress/strain free imaging layer(s) to improve dynamic belt cyclic motion quality and extend service life.
    Type: Application
    Filed: April 16, 2010
    Publication date: October 20, 2011
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Stephen T. Avery, Yuhua Tong, Michael S. Roetker, Jimmy E. Kelly, Kyle B. Tallman
  • Publication number: 20110256475
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members which include a protective overcoat layer comprising specific low surface energy polycarbonates of excellent optical clarity and having a slippery and adhesive surface to impact toner image transfer efficiency to receiving papers and effect contact friction reduction by which imaging members abrasion/wear resistance is enhanced. The present embodiments also disclose a process for making and using these members.
    Type: Application
    Filed: April 19, 2010
    Publication date: October 20, 2011
    Applicant: XEROX CORPORATION
    Inventor: Robert C. U. Yu
  • Publication number: 20110255904
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Application
    Filed: June 14, 2011
    Publication date: October 20, 2011
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Stephen T. Avery, Kathleen M. Carmichael
  • Patent number: 8026028
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising slippery polyhedral oligomeric silsequioxane molecules that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: September 27, 2011
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Publication number: 20110229808
    Abstract: Present embodiments are directed to the improvement of flexible imaging members used in electrophotography. More particularly, embodiments pertain to a structurally simplified curl-free flexible electrophotographic imaging member without the need for an anticurl back coating, having a functionally improved top outermost exposed slippery imaging layer which furthers extends service life, and provides a process for making and using the member.
    Type: Application
    Filed: March 17, 2010
    Publication date: September 22, 2011
    Applicant: Xerox Corporation
    Inventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery
  • Patent number: 8021812
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising slippery polyhedral oligomeric silsequioxane molecules that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: September 20, 2011
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Patent number: 8016968
    Abstract: There is provided a process for producing a seamed, flexible electrostatographic imaging member belt comprising providing a flexible, substantially rectangular, electrostatographic imaging sheet having a first major exterior surface opposite and parallel to a second major exterior surface and a first marginal end region of said sheet opposite and parallel with a second marginal end region; shaping said first marginal end region at an angle to form a first new sloping surface between the first major exterior surface and the second major exterior surface, shaping said second marginal end region at an angle to form a second new sloping surface between the first major exterior surface and the second major exterior surface, wherein the second new sloping surface is substantially parallel with the first new sloping surface; forming the sheet into a loop and overlapping said first new sloping surface with said second new sloping surface to form a mated region; and, joining said first new sloping surface to said seco
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: September 13, 2011
    Assignee: Xerox Corporation
    Inventors: Michael Stephen Roetker, Donald Laflair, David Martin, Felix J. Santana, John Joseph Darcy, III, Scott Griffin, Robert C. U. Yu
  • Patent number: 8007970
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: August 30, 2011
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Publication number: 20110207038
    Abstract: A flexible imaging member comprising a slippery charge transport layer including a novel low surface energy polymer binder and a charge transport compound in the layer. In specific embodiments, the novel low surface energy polymer binder in the charge transport layer is a bisphenol A polycarbonate containing short polysiloxane segments present in the polycarbonate backbone—thus eliminating the light scattering effect to render optical clarity—and the charge transport compound is a diamine hole transporting species. The imaging member does include an anticurl back coating to maintain flatness.
    Type: Application
    Filed: February 24, 2010
    Publication date: August 25, 2011
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery, Jimmy E. Kelly
  • Patent number: 8003285
    Abstract: Embodiments pertain to a flexible imaging member used in electrostatography and processes for making and using the imaging member. More particularly, the embodiments pertain to a structurally simplified flexible electrophotographic imaging member that has reasonable flatness and exhibits good performance without the need of an anticurl back coating layer.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: August 23, 2011
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery, Michael S. Roetker
  • Patent number: 7998646
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: August 16, 2011
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Kathleen M. Carmichael